Problems with templating the email

Hi there,

Is there a tutorial how to customizing the email templates? A short description about the concept of this development and a way to customizing it would be great (in example: it is neccessary to customize each .html.php file for bring away the table-lines? or: where I can find the files in joomla webspace. editing in the backend it is not comfortable)

we are not looking for a customizations but only for instructions on how to proceed!

thank you for any answers